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+15% attack speed or 10 magicpen?

In your opinion, is +10 magic pen worth it on a slow caster like Annie instead of +15% attack speed? I find the +15% allows me to last hit as annie with my normal almost all the time instead of disintegrate which increases gold intake and frees up a spell to harass the enemy. Magic pen is relatively easy to get (Abyssal, Void, Sorcerers, etc.) and I already have +15% in mastaries.

In your opinion, is +10 magic pen worth it on a slow caster like Annie instead of +15% attack speed? I find the +15% allows me to last hit as annie with my normal almost all the time instead of disintegrate which increases gold intake and frees up a spell to harass the enemy. Magic pen is relatively easy to get (Abyssal, Void, Sorcerers, etc.) and I already have +15% in mastaries.

Think of it this way: your primary damage source is going to be Spells. Even if you are constantly autoattacking in a teamfight, you're doing at level 18, 94 damage per attack .698 times per second. 15% attackspeed changes this to .784 times per second. Whoopie. You're getting less than one attack per ten seconds increase here, meaning your DPS increases by 10.

You want to be last hitting with Disintegrate anyways, as that builds up stun charges for free.

Also, Magic Pen gives you an amazing increase to the DPS of your spells, as it is a percentage increase. If your opponent has MR, they are reducing your damage by a percentage. If you penetrate all of their MR, then your spells do 100% damage. 10 magic pen from your runes is absolutely essential.

Attack speed on annie? Come on. Attack speed should rarely if ever give you any more last hits, especially on annie. Try timing your attacks instead of attacking automatically. And there's little reason to not use disintegrate for last hitting, since it refunds the mana when you get the last hit with it.

In your opinion, is +10 magic pen worth it on a slow caster like Annie instead of +15% attack speed? I find the +15% allows me to last hit as annie with my normal almost all the time instead of disintegrate which increases gold intake and frees up a spell to harass the enemy. Magic pen is relatively easy to get (Abyssal, Void, Sorcerers, etc.) and I already have +15% in mastaries.

10 magic pen is way, way, way better than 15% attack speed on Annie. First of all, attack speed doesn't help you last hit hardly at all, that's attack damage. It's all about getting the last hit, which means you want to fit in that last killing blow, not DPS. More damage = more room for last hitting. More attack speed is only helpful if you auto-attack, in which case you should learn not to. Besides, as other people have said, you have Disintegrate for last-hitting. Even level 1 Disintegrate does more than your physical attacks.

Magic Penetration may have a few sources, but that 10 magic pen is a huge difference. Especially when you have other sources of Magic Penetration. Mathematically, penetration is *more* effective the more you get, until you've penetrated all of their magic resistance. % penetration and flat penetration stack amazingly, as do reduction and flat penetration. However, reduction and % penetration stack poorly. So Void Staff and Abyssal Scepter are a bad choice together, but any other combination works very well.